- Add low battery warning ack check to onSwitchChanged(), reset the
switch to off once it's 1st time launch, the switch should be enable
by battery saver change event at 1st instead of enable directly, will
not check this state anymore after 1st launch
Bug: 227725656
Test: make RunSettingsRoboTests
Change-Id: I79f502f567fae5dd10166d8b24fd50d59c261001